HOMEVULNERABILITIESCVE-2021-22727
CRITICAL

CVE-2021-22727

CWE-331Published: July 21, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to gain unauthorized access to the charging station web server

NVD Source

Technical Analysis

CVE-2021-22727 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

schneider-electric12 product(s)
evlink city evc1s22p4 firmwareevlink city evc1s22p4evlink city evc1s7p4 firmwareevlink city evc1s7p4evlink parking evw2 firmwareevlink parking evw2evlink parking evf2 firmwareevlink parking evf2evlink parking ev.2 firmwareevlink parking ev.2evlink smart wallbox evb1a firmwareevlink smart wallbox evb1a
Source: NVD CPE · 12 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06
ADVISORYhttp://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06

All References (2)

→
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06Vendor Advisory
→
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06Vendor Advisory

Quick Facts

CVE IDCVE-2021-22727
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-331
CISA KEVNo
Affected1 vendor(s)
PublishedJul 21, 2021

Related CVEs (CWE-331)

CVE-2024-25730
9.8
CVE-2024-36400
9.8
CVE-2023-4344
9.8
CVE-2023-31176
9.8
CVE-2023-49599
9.8
CVE-2013-2260
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-22727 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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